Your doing the right thing by trying the Baytril for a good seven days while symptoms are showing, but if Dante is still sneezing frequently after say, five/six days before the Baytril runs out and your not seeing much or any improvemnt, I would be questioning two things:
1. Is the dosage high enough and frequent enough?
2. Does the drug need changing to something that targets mycoplasma itself?
Sometimes it`s worth saying to a vet that you know a little about this bacteria because they will just treat you like a lesser otherwise and fob you off with baytril Not that baytril is a bad choice, it`s just that it`s their first line of action with small animals, so they won`t go straight into looking at drugs that are used against this organism. Sometimes they need persuading.
How is Dante today? Do your rats sleep most of the day? They usually just wake up for a snack and a drink and are more active in the evenings, but it varies between rats really. Rats can go about sneezing a lot but be otherwise healthy. It`s not until they get lower respiratory issues that they can go downhill and start abdominal breathing and get weight loss and stop eating.
Rats and myco come hand in hand sadly and I wish that wasn`t the case. I stopped keeping rats eventually because it got too stressful for me having to watch them get ill all the time and of the rats I did keep, one died of very old age and hind leg paralysis. Two of my other rats I lost to heart failure and urolithiasis, which is basically crystals/stones that form in the bladder and the rat passes blood. It can cause a lot of pain if not operated on. I just couldn`t face that again.
Keep their urine acidic by giving apple slices a few times a week.